Improvement in lamps



G. W. THOMSON. Lamp.

No. 105,867. Patented July 26, 1870.

N PETERS, PNOTOLITEIOQRAPHER, WASIHNGTON. D C.

GEORGE W, THOMSON, or BUFFALO, NEW YORK.

Lam Patent No. 105,867, dated July 26, 1870.

IMPROVEMENT m LAMPS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern:

Be it known that I, GEORGE 'W. THOMSON, of Bnfi'alo, in the county of Erie, in the State of New York, have invented a new and improved Mode of v Preventing Coal-oil Lamps from Exploding; and I do hereby declare that the following is a full and ex- ;aotdescription thereof, reference'being had to the accompanying drawing and to the letters of reference marked thereon; i 1 I l The nature of my inventioneonsists in using a strong conducting power or medi rim to transfer rapidly the heatfrom the collar A to an'absorbing mineral mixture or compound in the bottom '0 of the lamp,

thus preventing the liquid from becoming heated while 'burning.

The conducting power or medium I use for this purpose is sheet copper, tinned on 'o'ne' side, commonly called boiler copper, made into auy'desirable shape or style that provides fora reservoir "below the fount B B, to hold the absorbing mixture or compound.

The mineral mixture or compound I nseto absorb.

the heat in the bottom of the lamplis a mixture of marble-dust, plasterof Paris, water, or quicklime, and salt. i i This mixture makes a compound that is always cool and operates as an absorbent for the heatas it is transferred from the collar A by the conducting power of thecopper, v l l Thecopper can be coated, bronzed, or plated, to

' plosion. V 1

WhatI claim as my invention, and desire to secure suit the taste, without diminishing its conducting power.

The inside tinning of the copper prevents, in agreat degree, the heat, in its passage through the copper to the absorbing mixture'below, from communicatingwith the liquid in the lamp, and heating it.

. l deem it highly improbable, if notaltogethcr impossible,,ior a lamp constructed as above describedto explode, whatever may be the liquid contained in it.

' The collarnever becomes heated by burning either coal-oil of heavy gravity nor fluid of light gravity, no matter how long it may burn nor how nearly the liquid in the lamp may beexhausted.

Hence its entire safetyagamst and liability to exby Letters Patent, is-

lhe'application of sheet copper, tinned on the 1 in-' side, in the construction of lamps, as a conducting power to transfer the heat rapidly and constantly from the collar to the bottom of the lamp, as herein de-' scribed, when used with the aforesaid mineral compound as an absorbing reservoir, or any other filling, substantially the same, which will produce the in tended effect.

GEO. W. THOMSON.

Witnesses WM. B. GARVEY, ELIZABETH B. THOMSON. 

